We threw the game against West Ham. We sent out a weakened side, Poch called the cup crap and said he didn't think winning it was important. Surprise, surprise, we switched off, gave up three goals and lost against a more committed side - Poch admitted as much post-game.
Threw the game, threw the cup because we're apparently far, far too good to bother with such things now. But not good enough to win against a title challenger without Kane, apparently.
As for that bit about margins and it being a tough game, them's the shakes when you make the decision to prioritize one game over another. You choose to save your energy for one game and another is lost as a result, then the judgement will fall on you regarding the outcome in the game you saved up for. And if you lose both, then you really don't have much of a defence to call on - you chose to maximise the chances of getting a result in one game over another, and failed to get a result in either. So, you get stick. And you deserve it.
As Poch would say, 'that is futbol'. If you want to make it about results, you get judged on results.